mirror of
https://github.com/AsahiLinux/u-boot
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212 lines
4.6 KiB
C
212 lines
4.6 KiB
C
/*
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* Copyright (c) 2004 Cucy Systems (http://www.cucy.com)
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* Curt Brune <curt@cucy.com>
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*
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* (C) Copyright 2004
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* DAVE Srl
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* http://www.dave-tech.it
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* http://www.wawnet.biz
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* mailto:info@wawnet.biz
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*
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* (C) Copyright 2002-2004
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* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* MODULE: $Id:$
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* Description: UART/Serial interface for Samsung S3C4510B SoC
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* Runtime Env: ARM7TDMI
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* Change History:
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* 03-02-04 Create (Curt Brune) curt@cucy.com
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*
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*/
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#include <common.h>
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#include <asm/hardware.h>
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#include "s3c4510b_uart.h"
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DECLARE_GLOBAL_DATA_PTR;
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static UART *uart;
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/* flush serial input queue. returns 0 on success or negative error
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* number otherwise
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*/
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static int serial_flush_input(void)
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{
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volatile u32 tmp;
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/* keep on reading as long as the receiver is not empty */
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while( uart->m_stat.bf.rxReady) {
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tmp = uart->m_rx;
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}
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return 0;
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}
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/* flush output queue. returns 0 on success or negative error number
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* otherwise
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*/
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static int serial_flush_output(void)
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{
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/* wait until the transmitter is no longer busy */
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while( !uart->m_stat.bf.txBufEmpty);
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return 0;
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}
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void serial_setbrg (void)
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{
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UART_LINE_CTRL ulctrl;
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UART_CTRL uctrl;
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UART_BAUD_DIV ubd;
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serial_flush_output();
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serial_flush_input();
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/* control register */
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uctrl.ui = 0x0;
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uctrl.bf.rxMode = 0x1;
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uctrl.bf.rxIrq = 0x0;
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uctrl.bf.txMode = 0x1;
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uctrl.bf.DSR = 0x0;
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uctrl.bf.sendBreak = 0x0;
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uctrl.bf.loopBack = 0x0;
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uart->m_ctrl.ui = uctrl.ui;
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/* line control register */
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ulctrl.ui = 0x0;
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ulctrl.bf.wordLen = 0x3; /* 8 bit data */
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ulctrl.bf.nStop = 0x0; /* 1 stop bit */
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ulctrl.bf.parity = 0x0; /* no parity */
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ulctrl.bf.clk = 0x0; /* internal clock */
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ulctrl.bf.infra_red = 0x0; /* no infra_red */
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uart->m_lineCtrl.ui = ulctrl.ui;
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ubd.ui = 0x0;
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/* see table on page 10-15 in SAMSUNG S3C4510B manual */
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/* get correct divisor */
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switch(gd->baudrate) {
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case 1200: ubd.bf.cnt0 = 1301; break;
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case 2400: ubd.bf.cnt0 = 650; break;
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case 4800: ubd.bf.cnt0 = 324; break;
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case 9600: ubd.bf.cnt0 = 162; break;
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case 19200: ubd.bf.cnt0 = 80; break;
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case 38400: ubd.bf.cnt0 = 40; break;
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case 57600: ubd.bf.cnt0 = 26; break;
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case 115200: ubd.bf.cnt0 = 13; break;
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}
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uart->m_baudDiv.ui = ubd.ui;
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uart->m_baudCnt = 0x0;
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uart->m_baudClk = 0x0;
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*
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*/
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int serial_init (void)
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{
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#if CONFIG_SERIAL1 == 1
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uart = (UART *)UART0_BASE;
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#elif CONFIG_SERIAL1 == 2
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uart = (UART *)UART1_BASE;
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#else
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#error CONFIG_SERIAL1 not equal to 1 or 2
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#endif
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serial_setbrg ();
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return (0);
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}
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/*
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* Output a single byte to the serial port.
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*/
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void serial_putc (const char c)
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{
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/* wait for room in the transmit FIFO */
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while( !uart->m_stat.bf.txBufEmpty);
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uart->m_tx = c;
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/*
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to be polite with serial console add a line feed
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to the carriage return character
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*/
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if (c=='\n')
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serial_putc('\r');
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}
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/*
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* Test if an input byte is ready from the serial port. Returns non-zero on
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* success, 0 otherwise.
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*/
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int serial_tstc (void)
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{
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return uart->m_stat.bf.rxReady;
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int serial_getc (void)
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{
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int rv;
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for(;;) {
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rv = serial_tstc();
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if (rv) {
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return uart->m_rx & 0xFF;
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}
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}
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}
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void serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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/* busy wait for tx complete */
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while ( !uart->m_stat.bf.txComplete);
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/* clear break */
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uart->m_ctrl.bf.sendBreak = 0;
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}
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